JPH0641064U - Coaxial cable plug connection structure - Google Patents

Abstract

(57) [Abstract] [Purpose] As the diameter of the coaxial cable becomes thinner, it becomes difficult to assemble with the conventional coaxial type. Therefore, use a type that connects the center conductor and the shield conductor of the cable to each of the two pin contacts. . However, this type has poor high frequency characteristics. Further, when the cable has a smaller diameter, it becomes difficult to assemble even with this type. To solve this problem. [Constitution] Contact 4 is provided on each side of the insulating substrate 42.
4, 48 are provided. Connect the end of the coaxial cable 10 to the substrate 42
Through, the center conductor 12 is connected to the solder land 46 (integrated with the contact 44), and the shield conductor 16 is connected to the solder land 50 (integrated with the contact 48). With this structure, even an extremely thin coaxial cable can be easily connected. Further, since the contact area and spacing can be freely designed, impedance matching with the coaxial cable is facilitated and the VSWR value can be easily set to be less than 1.2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connection structure of a plug of a connector connected to a terminal of a coaxial cable, and particularly to a connection structure of a plug for a coaxial cable, which is suitable for a coaxial cable having a small diameter.

[0002]

[Prior art]

 FIG. 5 schematically shows an example of a conventional coaxial plug. 10 is a coaxial cable, 12 is its center conductor, 14 is a cable insulator, 16 is a shield conductor (biased conductor), and 18 is a jacket. Reference numeral 20 denotes a plug, and in the main body portion, a center contact 24 which is a metal pin is held by a cylindrical insulator 26 on the center axis of an outer conductor 22 which is a cylindrical metal. As for the connection of this plug, the exposed coaxial cable 10 is drawn in from the right side of the figure, the center conductor 12 is soldered to one end of the center contact 24, and the shield conductor 16 is soldered or press-fitted to the outer conductor 22. Done.

FIG. 6 schematically shows another conventional example. In this example, the center conductor 12 and the shield conductor 16 of the coaxial cable 10 are connected to the two pin-shaped contacts 32 and 34, respectively. The coaxial cable plug shown in FIG. 5 is a connector with good high-frequency characteristics, but on the other hand, it has the disadvantage that the connecting work becomes extremely difficult as the diameter of the coaxial cable becomes smaller. Therefore, when the diameter of the coaxial cable is 1 to 2 mm or less, the plug shown in Fig. 6 is used.

[0004]

[Problems to be solved by the device]

 When the diameter of the coaxial cable is 1 to 2 mm or less, the plug shown in Fig. 6 is used as described above. However, in this form of plug, the characteristic impedance must match that of the coaxial cable. Is almost impossible, and it is difficult to set the VSWR value to 1.3, which is much higher than the practical value of 1.2, and there is a drawback that the deterioration of the high frequency characteristics must be accepted.

Further, in recent years, the coaxial cable has been extremely thinned, and the outer diameter of the shield conductor is now about 200 μm, and the center conductor diameter in this case is about 100 μm. With such a small-diameter coaxial cable, even the plug having the shape shown in FIG. 6 cannot be easily connected.

[0006]

[Means for Solving the Problems]

 In view of the above problems, the present invention provides a connection structure for a coaxial cable plug in which characteristic impedance matching is relatively easy and the wiring work is easy. For example, as shown in FIG. 1, contacts 44 and 48 are provided on the front and back of the insulating substrate 42, respectively. These tips reach the edge of the substrate 42. The leading end of the coaxial cable 10 that is exposed is passed through the insulating substrate 42, the center conductor 12 is connected to the solder land 46 (integrated with the contact 44), and the shield conductor 16 is connected to the solder land 50 (integrated with the contact 48). The plug 40 is inserted into a receptacle (not shown) to make a connector connection.

[0007]

[Action]

 In the present invention, the center conductor 12 and the shield conductor 16 of the coaxial cable are separately soldered on the back side and the front side of the insulating base plate 42, and for this purpose, the center conductor 12 and the shield conductor 16 are extended and routed. Therefore, even with an extremely thin coaxial cable, the wiring work is easy. Further, since the solder lands and the contacts are fixed and developed on the front and back surfaces of the insulating substrate 42 or on the same surface, the areas and the intervals between them are extremely free as compared with, for example, the case shown in the example of FIG. It becomes easy to match the characteristic impedance with that of the coaxial cable or to bring it close to it, and it is possible to obtain a coaxial cable plug connection structure with good high-frequency characteristics.

[0008]

Embodiment 1 FIG. 1 (A) is an external perspective view of Embodiment 1, and FIG. 1 (B) is a sectional view of FIG. 1 (A). An insulating substrate 42 is made of a rectangular glass epoxy resin plate. A contact 44 and a solder land 46 (these are integrated) and a contact 48 and a solder land 50 (these are also integrated) are provided on each of the both surfaces. These are thin copper plates attached and gold-plated. A through hole 52 is provided between the solder lands 46 to 50. The copper plate may be formed using conventional printed circuit board fabrication techniques. The end of the coaxial cable 10 is exposed, passed through the through hole 52, and the center conductor 12 is connected to the solder land 46 by, for example, soldering. Similarly, the shield conductor 16 is connected to the solder land 50. In this way, the extremely thin coaxial cable 10 can be easily connected.

In this example, the thickness of the insulating substrate 42 is 0.5 mm and the thickness of the copper plate is 0.05 mm for a coaxial cable (outer diameter is 0.35 mm) having a shield conductor outer diameter of 0.3 mm. The diameter of the through hole 52 is about 0.2 mm, and the size is such that the cable insulator (diameter of about 0.2 mm) of the coaxial cable can be inserted.

Further, in this example, as shown in FIG. 1A, a notch 54 into which the jacket 18 of the coaxial cable 10 can be press-fitted is provided in the insulating substrate 42 above the through hole 52, and the coaxial cable 10 is I am running around. By doing so, even when a tensile force is applied to the coaxial cable 10, the force is not directly applied to the soldered portion.

[0011]

Second Embodiment FIGS. 2A and 2B show another example. FIG. 2B shows a partial cross-sectional view, and FIG. 1A shows the left side surface of FIG. The feature of this example compared with the first embodiment is that a contact 62 connected to the shield conductor 16 is provided on the back side of the solder land 50 of the contact 48, and a plated through hole 64 is provided between them. The point is that they are electrically connected. The contact 62 (which is connected to the shield conductor of the cable) is provided on the surface of the insulating substrate 42 so as to surround the contact 44 (which is connected to the center conductor of the cable). By doing so, the high frequency characteristics are improved.

In this example, the width of each contact is 0.3 mm, and the space between each contact is 0.2 mm. The receptacle (not shown) into which the plug 60 is fitted has a contact pitch of 0.5 mm, which can be easily obtained by the conventional technique for manufacturing a multipolar connector.

[0013]

Third Embodiment FIG. 3 shows an example in which a single-core plug 40 of the first embodiment has a common insulating substrate 42 and is connected horizontally to form a multi-core coaxial cable plug. Thus, the present invention can be easily applied to a multi-core plug.

[0014]

Fourth Embodiment FIG. 4 shows a surface provided with a contact when the plug 60 of the second embodiment is continuous to form a multi-core plug. In this example, the contact 44 (which is connected to the central conductor 12) is surrounded by the contact 62 (which is connected to the shield conductor 16), and the contact 44 is further surrounded by the frame ground contact 66. There is. In this case, the shield conductor of each cable is not necessarily set to zero potential, but the frame ground contact 66 is grounded to zero potential. By doing so, the high frequency characteristics can be further improved.

[0015]

[Effect of device]

 (1) Conventionally, in the case of extremely thin coaxial cables, the contacts to be used have to be made correspondingly thin, but in the case of pin contacts, etc., the mechanical strength of the contacts themselves and the ease of handling during assembly etc. However, it was difficult to manufacture, but with the present invention, it can be manufactured without any difficulty. (2) According to the configuration of the present invention, it becomes easy to set the VSWR value representing the high frequency characteristic to less than the practical value of 1.2.

[Brief description of drawings]

FIG. 1A is an external perspective view of a first embodiment of the present invention,
(B) shows a cross-sectional view of (A).

FIG. 2B is a partial sectional view of a second embodiment of the present invention,
(A) shows the left side surface of (B).

FIG. 3 is an explanatory diagram of Embodiment 3 of the present invention.

FIG. 4 is an explanatory diagram of Embodiment 4 of the present invention.

FIG. 5 is an explanatory diagram of an example of a conventional technique.

FIG. 6 is an explanatory diagram of another example of the conventional technique.

[Explanation of symbols]

 10 coaxial cable 12 center conductor 14 cable insulator 16 shield conductor 18 cable jacket 20, 30, 40, 60 plug 22 outer conductor 24 center contact 26 insulator 32, 34 contact 42 insulating substrate 44 contact (for center conductor) 46, 50 solder land 48, 62 contact (for shield conductor) 52 through hole 64 plated through hole 66 frame ground contact

Claims (1)

[Scope of utility model registration request] 1. A coaxial cable plug comprising a center conductor, a shield conductor, and a cable insulator interposed between the center conductor and the shield conductor, wherein the center conductor and the shield conductor are respectively connected to contacts of a connector. In the connection structure, a contact in which a conductive plate fixed on an insulating substrate is terminated at an edge of the insulating substrate, and conductive plates fixed on both sides of the insulating substrate are penetrated by through holes. Each has a solder land connected to the contact, an end portion of the coaxial cable is inserted into the through hole, a center conductor is provided on the solder land on the one side, and a shield conductor is provided on the solder land on the other side. A connection structure of a plug for a coaxial cable, characterized in that